<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        #top{
            width: 100%;
            height: 14%;
            background: aqua;
            float: left;
            border: 0;
        }

        #left{
            width: 14%;
            height: 86%;
            background: orange;
            float: left;
            border: 0;
        }

        #right{
            width: 86%;
            height: 86%;
            background: gold;
            float: right;
            border: 0;
        }

        body{
            height: 900px;
        }

    </style>

</head>
<body>
    <iframe src="_top.html" id="top" ></iframe>
    <iframe src="_left.html" id="left" ></iframe>
    <iframe src="_right.html" id="right" name="right_manage"></iframe>
</body>
</html>